Biodegradable Metal Vascular Closure Device
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Solution Overview
Problem
Current vascular closure devices fail to provide a complete and effective seal of blood vessel punctures, leading to prolonged bleeding and patient immobility due to the need for pressure bandages, which are not always successful in preventing blood clot dislodgment.
Innovation Solution
An absorbable metal closure device comprising internal petals and an external expandable retainer, secured by a bioabsorbable filament, that aligns and expands to cover the puncture site, providing a secure seal and allowing for biological repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure bandage is applied to stop bleeding from vascular puncture, then bleeding is controlled, but patient mobility is restricted and blood clot may be dislodged
Solution Approach 1:
The closure device is divided into multiple functional segments: an internal member with petals that seal the vessel lumen, an external member with expandable retainers that anchor to vessel wall tissue, and a filament system that couples them. This segmentation allows each component to perform its specific function independently, achieving reliable bleeding control while eliminating the need for external pressure bandages that restrict mobility.
Solution Approach 2:
The filament acts as an intermediary element that couples the internal member and external member together. By tensioning the filament, the petals are drawn into apposition against the vessel wall while the expandable retainers anchor externally, creating a secure seal without requiring prolonged external compression that would limit patient movement.
2Ease of manufacture
If suture devices are used to close aperture, then some closure is achieved, but complete seal is not provided
Solution Approach 1:
The closure function is divided between the internal member's petals that seal the lumen and the external member's expandable retainers that anchor to tissue. This dual-segment approach provides both simplicity in deployment and completeness in sealing, overcoming the limitation of single-function suture devices.
Solution Approach 2:
The device transitions from a single-plane suture approach to a three-dimensional sealing mechanism. The petals are drawn into apposition against the vessel wall in one dimension, while the expandable retainers extend radially outward in another dimension to anchor securely, creating a complete seal that addresses both luminal and external closure requirements.
3Productivity
If staple based devices are used to pinch vessel puncture closed, then aperture is blocked, but complete seal and tissue repair are not achieved
Solution Approach 1:
The device changes the physical state and positioning of tissue through controlled parameter changes. The filament is tensioned to draw petals into apposition, and the expandable retainers are deployed to anchor externally, creating progressive compression and sealing that maintains blood flow cessation while allowing tissue repair, unlike static staple devices.
Data Source
AI summary
A closure device to be inserted at least partially through a blood vessel wall aperture in a blood vessel wall. The closure device includes at least two parts, an internal part and an external part. The internal part is adapted to be extended at least partially through the blood vessel wall aperture and into the lumen to at least partially block the blood vessel wall aperture. Each of the internal part and the external part consists essentially of a metal that biodegrades within a living being in a period of time that permits biological repair of the blood vessel wall in and around the blood vessel aperture.